I was a "flash developer" for some time around 2005, but the Flash environment (what was it called, Macromedia Flash?) never really "clicked" for me. I was able to put together some interactive visualizations and even little games, but it was not simple for me. That changed when Adobe Flex and ActionScript came along. That's where I felt right at home. But I'm fully aware Flash made much more sense for others than it did for me.